lnfroducfion

This is an informative document that describes the packet data system architecfotur rae third generation wireless system based on IMT-2000. The general capabilitiesf or this system match those outlined in the ITU IMT-2000 requirements document Q.1701. As a general philosophy behind the design of this architecture, IETF protocols are employed whenever possible to minimize the number of new protocols required and to maximize the utilization of well accepted standards and hence the speed to market.

This document describes an architecture with two general services, local and public data network access and Private data network accesass, well as two access methods, Simple IP and Mobile IP. Several advanced features sucha s security associations and dynamic address assignment, as well as accounting, are accomplished using IETF protocols.

The document begins by describing the services offered. It then describes a functional model and the general functionsf or each component. Finally, a physical model with the appropriate mappings and detailed requirementsis provided. An annex attached provides general message flows.

The standardization of packet data servicies anticipated to occur as a phased project. While this document primarily describes features thaat re required for Version 1, several requirements which are targeted for Version 2 are also described. These features are not deemed reasonable to standardize in the immediate term, but are intended to be future requirements.This document will be revised at a later date to more fully describe subsequent versions.